As many users before me have said, centralized exchange are not completely secure, whatever their promises to their customers. Don't trust all your funds to an exchange, it should be in your wallet in the long term. Even though we believe in some exchanges, but basically we have to remain responsible for our assets there. This means that we accept any consequences that may occur, good or bad are the consequences.
There is no way centralized exchanges can be safe. Although some reputable ones are safer than we think, but we dont know how the future holds for them.
They'd be safe to some extent, after all we seem to know what the risks are.